JP2008300032A - Magnetic transfer device and magnetic transfer method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve transfer signal quality by increasing adhesion between a slave medium and a master carrier when transfer information such as servo signals is to be magnetically transferred from the master carrier to the slave medium, and at the same time, to improve productivity. <P>SOLUTION: A magnetic transfer is conducted by bringing information carrying surfaces of master carriers 3 and 4, on which a transfer pattern corresponding to information to be transferred is partially formed, into close contact with a slave medium 2 on which the pattern is transferred and by applying transfer magnetic field. Elastic members 17 and 18 are arranged between holders 11 and 12, which hold and press a superimposed body made of the slave medium and the master carriers on the both sides, and back surfaces of the master carriers. The portions on the elastic member surfaces facing the back surfaces of the master carriers and corresponding to the master carrier regions on which a transfer pattern is formed are protruded. The master carriers and the slave medium are pressed and adhered while the convex regions are aligned with the transfer pattern regions P of the master carriers. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a magnetic transfer apparatus and a magnetic transfer method for performing magnetic transfer from a master carrier carrying information to a slave medium.

  As a method for preformat recording or data recording of servo signals, etc. on magnetic recording media, a master carrier (patterned master carrier) in which a transfer pattern of servo signals etc. having a magnetic layer at least on the surface layer is formed in an uneven shape or an embedded structure Is applied to a magnetic recording medium having a magnetic recording layer (transfer medium (slave medium)), and a magnetic field for transfer is applied to the magnetic recording medium by applying a transfer magnetic field to the magnetic recording medium. Magnetic recording methods for recording have been proposed.

  When the magnetic recording medium is a disk-shaped medium such as a hard disk or a high-density flexible disk, an electromagnetic device or permanent magnet is attached to one or both sides of the magnetic recording medium in a state where a disk-shaped master carrier is closely attached to one or both surfaces. A magnetic field applying device using a magnet device is provided to apply a transfer magnetic field.

  In order to improve the transfer quality in the magnetic transfer, it is an important issue how to closely contact the slave medium and the master carrier with no gap. In other words, if there is poor adhesion, there will be areas where magnetic transfer will not occur, and if magnetic transfer does not occur, signal loss will occur in the magnetic information transferred to the slave medium, the signal quality will deteriorate, and the recorded signal will be In this case, there is a problem that the tracking function cannot be sufficiently obtained and the reliability is lowered.

  Therefore, when holding the master carrier in the holder and pressing and adhering to the magnetic recording medium, a method for improving the adhesion with the magnetic recording medium by adsorbing the master carrier to the flat holder surface and improving the flatness is proposed. (For example, refer to Patent Document 1). In addition, a method has been proposed in which an elastic member is interposed between the holder surface and the master carrier to allow fine elastic deformation of the master carrier and improve the adhesion with the magnetic recording medium (for example, Patent Document 2). reference).

  However, even if the entire surface of the slave medium is pressed evenly against the master carrier, it is actually difficult to evenly adhere to the entire surface due to various strains, residual air, etc., and partial adhesion failure occurs. And transfer failure occurs. In particular, the transfer information is not uniformly formed on the entire surface of the master carrier, but is formed partially in a substantially radial manner in the case of a servo pattern, for example, as shown in FIG. It has been found that good magnetic transfer can be performed if the adhesion can be secured at the transfer pattern portion.

Therefore, a method has been proposed in which the elastic body is pressed from the back surface of the slave medium by an elastic member corresponding to the transfer pattern for the servo signal of the master carrier and an area corresponding to the pattern portion formed in a convex shape ( For example, see Patent Document 3).
JP 2002-163823 A JP 2003-173525 A JP 2003-099922 A

  However, as described in Patent Document 3, in the method of pressing with the elastic member from the back surface of the slave medium, signal recording on the slave medium having the magnetic recording medium layer on both sides needs to be sequentially transferred on each side. . One-sided sequential transfer is time-consuming, and dust generated from the elastic member adheres to the slave medium, and the dust becomes a foreign substance interposed between the slave medium and the master carrier, which has a very large adverse effect on the adhesion, and the transfer quality. There is a problem that there is a very high risk of lowering.

  The present invention has been made in view of the above circumstances, and can improve the transfer signal quality by improving the adhesion between the slave medium and the master carrier in magnetic transfer, and shorten the manufacturing time of the magnetic recording medium and improve the productivity. It is an object of the present invention to provide a magnetic transfer apparatus and a magnetic transfer method that can be performed.

The first magnetic transfer device of the present invention includes a master carrier having a surface on which a transfer pattern corresponding to information to be transferred is partially formed, a slave medium that receives the transfer, and the master carrier that is in close contact with both sides of the slave medium A holder that presses the superimposed body from the back side of the master carrier when a transfer magnetic field is applied to the superimposed body, and is disposed between the back surface of the master carrier and the holder. In a magnetic transfer device provided with an elastic member
A portion of the surface of the elastic member, which faces the back surface of the master carrier, corresponding to a region where the transfer pattern of the master carrier is formed is formed in a convex shape.

The second magnetic transfer device according to the present invention includes a master carrier having a surface on which a transfer pattern corresponding to information to be transferred is partially formed, a slave medium that receives the transfer, and the master carrier that is in close contact with both sides of the slave medium. A holder that presses the superimposed body from the back side of the master carrier when a transfer magnetic field is applied to the superimposed body, and is disposed between the back surface of the master carrier and the holder. In a magnetic transfer device provided with an elastic member
A portion of the surface of the elastic member facing the holder corresponding to a region where the transfer pattern of the master carrier is formed is formed in a convex shape.

  In the first and second magnetic transfer apparatuses, the thickness of the convex portion provided on the elastic member is preferably more than 5 μm and less than 100 μm, and more preferably more than 10 μm and less than 50 μm.

The first magnetic transfer method of the present invention includes a superposition of a slave medium that receives a transfer and a master carrier that has a surface partially formed with a transfer pattern corresponding to the information to be transferred and is in close contact with both surfaces of the slave medium. In a magnetic transfer method for performing magnetic transfer by applying a magnetic field for transfer to the superimposed body in a state where the body is pressed and held from the back side of the master carrier by a holder,
Between the back surface of the master carrier and the holder, a portion corresponding to the region where the transfer pattern of the master carrier is formed on the surface of the elastic member that faces the back surface of the master carrier is formed in a convex shape. The elastic member is disposed and then pressed by the holder.

According to the second magnetic transfer method of the present invention, a slave medium that receives a transfer and a master carrier that has a surface partially formed with a transfer pattern corresponding to the information to be transferred and is in close contact with both surfaces of the slave medium. In a magnetic transfer method for performing magnetic transfer by applying a magnetic field for transfer to the superimposed body in a state where the body is pressed and held from the back side of the master carrier by a holder,
An elastic member is provided between the back surface of the master carrier and the holder so that a portion corresponding to the area where the transfer pattern of the master carrier is formed is convex on the surface facing the holder. A magnetic transfer method comprising pressing with the holder.

  In the first and second magnetic transfer methods, the thickness of the convex portion provided on the elastic member is preferably more than 5 μm and less than 100 μm, and more preferably more than 10 μm and less than 50 μm. Is more preferable.

  According to the first and second magnetic transfer apparatuses and methods of the present invention, the elastic member disposed between the back surface of the master carrier and the holder is formed on the surface facing the back surface of the master carrier or the surface facing the holder. Since the portion of the master carrier corresponding to the region where the transfer pattern is formed is formed in a convex shape, the concave / convex pattern forming portion of the master carrier and the recording surface of the slave medium can be efficiently and uniformly adhered to each other. This can prevent the occurrence of signal loss due to poor adhesion, improve the quality of the transfer signal and improve the reliability, and since the slave medium and the elastic member are not in contact, the slave medium of dust generated from the elastic member Double-sided magnetic recording type magnetic recording medium can be prevented from adhering to both sides and simultaneous transfer on both sides to a slave medium having a magnetic recording layer on both sides is possible. It is possible to shorten the manufacturing time for the production of, thereby improving the productivity.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a perspective view of a main part showing a state during transfer of the magnetic transfer apparatus of the present invention. 2 is an exploded perspective view of a transfer holder according to a reference example not included in the present invention, and FIG. 3 is a plan view of a master carrier and a spacer and a cross-sectional view of the spacer in the reference example of FIG. Each figure is a schematic diagram, and the thickness and the like are shown at a ratio different from the actual dimension.

  The magnetic transfer apparatus 1 shown in FIG. 1 has information to be transferred to one side and the other side of the slave medium 2 as shown in reference examples shown in FIGS. 2 and 4 and embodiments of the present invention shown in FIGS. A transfer holder 10 composed of first and second holders 11 and 12 for pressing and holding a superposed body of the master carriers 3 and 4 and the slave medium 2, respectively. The spacers 5 and 6 and the elastic members 7 and 8 interposed between the carrier 3 and the holder 11 and the master carrier 4 and the holder 12 and the air in the internal space of the transfer holder 10 are vacuum-sucked to reduce the inside. An adhesion pressure applying means including a vacuum suction means (not shown) for obtaining an adhesion force, and a magnetic field applying means 85 for applying a transfer magnetic field while rotating the transfer holder 10 are provided.

  The transfer holder in the reference example of FIG. 2 has the same basic structure as that of the embodiment of the present invention except for the spacer described later, and the first holder 11 on the left side and the second holder on the right side that can move relative to and away from each other. 12, the slave medium 2 and the master carriers 3 and 4 are accommodated in an internal space formed in the interior space in a state in which the respective center positions coincide with each other, and the slave medium 2 and the master medium are decompressed by the internal space. The carriers 3 and 4 are superposed and brought into close contact with each other. Support shafts protrude from the center positions of the back surfaces of the first holder 11 and the second holder 12, are supported by the apparatus main body, are linked to a rotation mechanism, and are rotated during magnetic transfer. In addition, the internal space of the transfer holder 10 is depressurized to a predetermined degree of vacuum at the time of close contact to obtain close contact between the slave medium 2 and the master carriers 3 and 4, and the close contact surface is vented to improve the close contact. In addition to increasing the pressure, compressed air is introduced when the atmosphere is released and when it is peeled off.

  The first and second holders 11 and 12 have circular suction surfaces 11a and 12a corresponding to the sizes of the master carriers 3 and 4, and the surfaces thereof are finished flat. The suction surface 11a has substantially uniform intake holes (a porous surface may be used). Although not shown, the suction hole is sucked by being connected to a vacuum pump through an intake passage led from the inside to the outside of the holders 11 and 12, and is sucked into the suction surfaces 11a and 12a via an elastic member and a spacer. The carrier is vacuum-adsorbed, and preferably the flatness of the master carrier is corrected along the adsorption surfaces 11a and 12a.

  The master carriers 3 and 4 are formed in a disk shape by a rigid body having center holes 3a and 4a opened. The master carriers 3 and 4 have a transfer information carrying surface 3b on which a fine magnetic pattern is formed on a surface of the substrate and a soft magnetic material is coated on the surface of the master carrier 3 and 4. 4b.

  As the substrate of the master carriers 3 and 4, nickel, silicon, quartz plate, glass, aluminum, alloy, ceramics, synthetic resin or the like is used. The formation of the concavo-convex pattern is performed by a stamper method or the like. The soft magnetic material is formed by depositing a magnetic material by a vacuum film-forming means such as a vacuum deposition method, a sputtering method, or an ion plating method, a plating method, or the like. Almost the same master carrier is used for in-plane recording and perpendicular recording.

  When the transfer information is a servo signal, the information carrier surface 3b of the master carrier 3 is substantially curved in the radial direction (in the illustrated case, slightly curved) as shown in FIG. 3A. A servo pattern (transfer pattern) is partially formed in a narrow area extending in the step. A region where the servo pattern is formed (hereinafter referred to as a transfer pattern region P) is a portion where uniform contact with the slave medium 2 is required, and the information carrying surface 3b of the master carrier 3 is transferred to the information carrier surface 3b. Pattern regions P and non-transfer pattern regions adjacent to the pattern regions P are alternately formed. A transfer pattern having a mirror image relationship with the transfer pattern of the information carrier surface 3b of the master carrier 3 is formed on the information carrier surface 4b of the master carrier 4.

The spacer 5 is formed of a plastic film or the like. As shown in FIGS. 3B and 3C, a hole 51 penetrating the back surface is provided in a region corresponding to the non-transfer pattern region of the master carrier 3. An inner ring portion 52 on the inner periphery, an outer ring portion 53 on the outer periphery, and a plurality of radiating portions 54 corresponding to the transfer pattern region P of the master carrier 3 that connect the inner ring portion 52 and the outer ring portion 53. It is configured to have a shape. The spacer 5 has a substantially uniform thickness over the entire region, and the thickness t _s is preferably more than 5 μm and not more than 100 μm. Functions as a convex portion if the thickness t _s is a 5μm greater is effective and 100μm order to have a sufficient flexibility of the spacer itself if less, the also a good adhesion to the elastic member. A more preferable thickness is more than 10 μm and less than 50 μm. The spacer 6 has substantially the same shape as the spacer 5.

  As a material of the spacer, a polyimide film, an aramid film, or the like can be used, and the hole can be formed by a mechanical method such as punching.

  The spacer 5 is positioned between the elastic member 7 and the back surface of the master carrier 3 so that the positions of the transfer pattern region P of the master carrier 3 and the radiating portion 54 of the spacer 5 are perpendicular to the pressurizing direction (superposed direction). It is positioned so as to coincide with each other in the plane and is held by the first holder 11. Similarly, the spacer 6 is positioned between the elastic member 8 and the back surface of the master carrier 4 so that the transfer pattern area of the master carrier 4 and the radiation portion of the spacer 6 coincide with each other. Held at 12.

The elastic members 7 and 8 are in contact with and pressed against the back surface of the master carrier, are formed in a disk shape from a material having elastic characteristics, and are held on the suction surfaces 11a and 12a of the holder. Specific materials for the elastic member include general rubber such as silicon rubber, polyurethane rubber, fluorine rubber, butadiene rubber, Teflon (registered trademark) rubber, Viton rubber, and foamed resin such as sponge rubber. The elastic member is configured to have a substantially uniform thickness over the entire surface, and the thickness t _d is preferably 100 μm or more and 3000 μm or less. Thickness t _d is a function (flexibility) is effective as an elastic material not more than 3000 .mu.m, also not too soft if 100μm or more, the elastic member is prevented from being excessively deformed during adhesion, the master carrier This is because it is preferable for uniform contact with the slave medium. A more preferable thickness is not less than 300 μm and not more than 700 μm.

  The magnetic field applying means 85 includes an electromagnet device 80 disposed on both sides of the transfer holder 10 as shown in the figure, and a coil 83 on a core 82 having a gap 81 extending in the radial direction of the transfer holder 10 of the electromagnet device 80. Is wrapped around. Both electromagnet devices 80 generate a magnetic field in the same direction parallel to the track direction. Further, the magnetic field applying means 85 may be constituted by a permanent magnet device instead of the electromagnet device. The magnetic field applying means in the case of perpendicular recording can be composed of electromagnets or permanent magnets with different polarities disposed on both sides of the transfer holder 10. That is, in the case of perpendicular recording, a transfer magnetic field is generated in a direction perpendicular to the track surface.

  Further, the magnetic field applying means 85 is configured so that the electromagnet devices 80 on both sides are moved toward or away from each other or the transfer holder 10 is inserted between the electromagnet devices 80 and 80 so as to allow the opening / closing operation of the transfer holder 10. 80, 80 or the holder 10 moves.

  Next, a magnetic transfer method using the magnetic transfer apparatus 1 will be described.

  The slave medium 2 as a non-transfer medium is a disk-shaped magnetic recording medium such as a hard disk or a high-density flexible disk having a magnetic recording layer formed on both sides. The magnetic recording layer is a coating type magnetic recording layer or a metal thin film type magnetic recording layer. When performing magnetic transfer, the magnetization of the slave medium 2 is previously preliminarily magnetized in the in-plane track direction for in-plane recording and in the vertical direction for perpendicular recording. The slave medium 2 is brought into close contact with the master carriers 3 and 4, and magnetic transfer is performed by applying a transfer magnetic field in a track direction or a vertical direction substantially opposite to the initial DC magnetization direction.

  The transfer holder 10 of the magnetic transfer apparatus performs magnetic transfer to a plurality of slave media 2 by a set of master carriers 3 and 4. First, the elastic member 7 is held on the attracting surface 11 a of the first holder 11. Further, it is positioned and held by a positioning mechanism (not shown) so that the radiation portion 54 of the spacer 5 and the transfer pattern region P of the master carrier 3 coincide. Similarly, the elastic member 8 is held on the suction surface 12a of the second holder 12, so that the radiation portion of the spacer 6 and the position of the transfer pattern region P of the master carrier 4 coincide in a plane perpendicular to the overlapping direction. Position and hold.

  Then, in the open state in which the first holder 11 and the second holder 12 are separated from each other, the slave medium 2 that has been initially magnetized in one of the in-plane direction and the vertical direction is set with the center position aligned, and then the second holder The holder 12 is moved closer to the first holder 11 to be in a closed state. The internal space of the transfer holder 10 containing the slave medium 2 and the master carriers 3 and 4 is depressurized by vacuum suction, and the slave medium 2 and the master carriers 3 and 4 are evenly adhered to each other by applying an even adhesion force. In order to apply the adhesion, in addition to vacuum suction, mechanical pressure may be applied from the outside.

  Thereafter, the electromagnet device 80 is brought close to both sides of the transfer holder 10, and a transfer magnetic field is applied in a direction almost opposite to the initial magnetization by the electromagnet device 80 while rotating the transfer holder 10, according to the transfer pattern of the master carriers 3 and 4. The magnetized pattern is transferred and recorded on the magnetic recording layer of the slave medium 2. The magnetic field for transfer applied at the time of the magnetic transfer is sucked into the convex pattern of the soft magnetic material in close contact with the slave medium 2 in the transfer pattern of the master carriers 3 and 4, and in the case of in-plane recording, the initial magnetization of this portion Is not reversed and the initial magnetization of the other part is reversed. In the case of perpendicular recording, the initial magnetization of this part is reversed and the initial magnetization of the other part is not reversed. Magnetization patterns corresponding to the transfer pattern are transferred and recorded on the front and back sides.

  According to the reference example of FIG. 2, when the slave medium 2 is brought into close contact with the master carriers 3 and 4, the radiating portions of the spacers 5 and 6 provided on the back surfaces of the master carriers 3 and 4 cause the master carrier 3 to move. Since the transfer pattern area is mainly pressed on the back surface of No. 4, the adhesiveness with the slave medium in the transfer pattern area can be improved, and transfer failure due to contact failure can be prevented and good magnetic transfer can be performed. Since the elastic member is arranged on the back of the master carrier and the slave medium does not contact the elastic member, the dust generated from the elastic member is difficult to adhere to the slave medium, thus preventing poor adhesion due to dust, and simultaneous double-sided A magnetic recording medium can be rapidly produced by transfer.

  FIG. 4 is an exploded perspective view of a transfer holder of a magnetic transfer apparatus of another reference example not included in the present invention. The general configuration of the magnetic transfer apparatus of the other reference example is the same as the reference example of FIG. In the following reference example, differences from the reference example of FIG. 2 will be mainly described. In addition, the same components as those of the magnetic transfer apparatus are denoted by the same reference numerals, and description thereof is omitted.

  In the magnetic transfer apparatus of the reference example of FIG. 2, the spacers 5 and 6 are disposed between the elastic members 7 and 8 and the master carriers 3 and 4, whereas in the present reference example, the spacer 5 Is disposed between the first holder 11 and the elastic member 7, and the spacer 6 is disposed between the second holder 12 and the elastic member 8. As in the case of the first embodiment, the spacers 5 and 6 are positioned and held by the holder so that the respective radiation portions coincide with the transfer pattern region of the master carrier. Therefore, when the master carrier and the slave medium are in close contact with each other, a pressing force is particularly applied to the transfer pattern region, so that the adhesion of the transfer pattern region is enhanced, and the same effect as in the first embodiment can be obtained.

  FIG. 5 is an exploded perspective view of the transfer holder 10 of the magnetic transfer apparatus according to the first embodiment of the present invention.

  In the present embodiment, the spacers 5 and 6 are not provided, and the area corresponding to the transfer pattern area P of the master carriers 3 and 4 on one surface of the elastic members 17 and 18 is formed in a convex shape. 2 to the reference example of FIG.

  FIG. 6 shows a plan view and a cross-sectional view of the elastic member 17 in the present embodiment. The elastic members 17 and 18 are in contact with the back surfaces of the master carriers 3 and 4 to press the master carriers 3 and 4 and are formed in a disk shape from a material having elastic characteristics. As shown in FIGS. 6A and 6B, the one surface 17a of the elastic member 17 has an uneven shape that mainly presses a portion of the transfer pattern region P corresponding to the transfer pattern region P of the master carrier 3. It is said that. That is, the one surface 17a has a plurality of radiations corresponding to the inner ring portion 72 on the inner periphery, the outer ring portion 73 on the outer periphery, and the transfer pattern region P of the master carrier 3 connecting the inner ring portion 72 and the outer ring portion 73. The portion 74 is formed in a convex shape, and the other portion is formed in a concave portion 71 (which may penetrate the back surface). Here, the inner ring portion 72 and the outer ring portion 73 formed in a convex shape are provided, but only the radiation portion 74 corresponding to the transfer pattern region P of the master carrier 3 is formed in a convex shape. It may be.

  The materials of the elastic members 17 and 18 are the same as those of the elastic members 7 and 8 of the previous reference example, and have elastic characteristics that do not excessively increase the pressing area when pressure is applied. Specific examples of the material include general rubber such as silicon rubber, polyurethane rubber, fluorine rubber, butadiene rubber, Teflon (registered trademark) rubber, and Viton rubber, and foamed resin such as sponge rubber.

  The thickness t from the upper surface of the convex portion of one surface of the elastic member 17 (and 18) to the other surface is desirably 100 or more and 3000 μm or less. If the thickness t is 3000 μm or less, the function (flexibility) as an elastic material is effective. If the thickness t is 100 μm or more, it is too soft to suppress excessive deformation of the elastic member when closely attached, and the master carrier and slave This is because it is preferable for uniform contact with the medium. A more preferable thickness is not less than 300 μm and not more than 700 μm. The thickness t ′ of the convex portion is preferably in the range of more than 5 μm and not more than 100 μm. If the thickness t ′ exceeds 5 μm, the function as a convex portion is effective, and if it is 100 μm or less, the shape of the convex portion is stable at the time of close contact and easily matches the transfer pattern region of the master carrier. Because you can. A more preferable convex portion thickness t ′ is more than 10 μm and less than 50 μm.

  For a uniform elastic member, a concave portion is formed by, for example, a water jet processing method, and processed into a shape partially including a convex portion. The elastic member 17 has its one surface 17a facing the back surface of the master carrier 3, and the positions of the transfer pattern region P of the master carrier 3 and the radiating portion 74 of the one surface 17a are in the pressurizing direction (superimposed direction). The first holder 11 is positioned so as to coincide with each other in a plane perpendicular to the first holder 11. Similarly, the elastic member 18 is such that the surface on which the convex portion is provided faces the back surface of the master carrier 4 so that the transfer pattern area of the master carrier 4 and the convex radiation portion on the one surface are aligned. So as to be held by the second holder 12.

  According to the present embodiment, when the slave medium 2 is brought into close contact with the master carriers 3 and 4, the radiating portions of the elastic members 17 and 18 provided on the back surfaces of the master carriers 3 and 4 cause the master carrier 3 to move. Since the transfer pattern area is mainly pressed on the back surface of No. 4, the adhesiveness with the slave medium in the transfer pattern area can be improved, and transfer failure due to contact failure can be prevented and good magnetic transfer can be performed. Since the elastic member is arranged on the back of the master carrier and the slave medium does not contact the elastic member, the dust generated from the elastic member is difficult to adhere to the slave medium, thus preventing poor adhesion due to dust, and simultaneous double-sided A magnetic recording medium can be rapidly produced by transfer.

  FIG. 7 is an exploded perspective view of the transfer holder 10 of the magnetic transfer apparatus according to the second embodiment of the present invention.

  As in the first embodiment, the present embodiment includes elastic members 17 and 18 that do not have a spacer, and one surface of which has a convex shape corresponding to the transfer pattern region of the master carrier. .

  In the magnetic transfer device according to the second embodiment, the elastic members 17 and 18 are arranged so that the surfaces on which the convex portions are formed are opposed to the back surfaces of the master carriers 3 and 4. In the embodiment, the surfaces of the elastic members 17 and 18 on which the convex portions are formed are arranged so as to face the suction surface of the holder. Here, since the transfer pattern areas of the master carriers 3 and 4 are in a mirror image relationship, the shape of the convex portion of the elastic member provided on each back surface is also in the mirror image relationship between the elastic members 17 and 18, and the transfer of the master carrier is performed. The elastic member 17 is disposed on the back surface of the master carrier 4 and the elastic member 18 is disposed on the back surface of the master carrier 3 so that the pattern and the convex radiating portion coincide.

  As in the case of the first embodiment, the elastic members 17 and 18 are positioned and held by the holder so that the respective convex radiating portions coincide with the transfer pattern region of the master carrier. Therefore, when the master carrier and the slave medium are in close contact with each other, a pressing force is particularly applied to the transfer pattern region, so that the adhesion of the transfer pattern region is enhanced and the same effect as in the above embodiment can be obtained.

  In the above embodiment, the transfer patterns of the master carriers 3 and 4 are in a mirror image relationship, but the two patterns are not necessarily in a mirror image relationship.

  In the first and second embodiments, it is not always necessary to provide both holders with an elastic member having a convex shape on one surface, and one holder side is provided with an elastic member having a uniform thickness, and the other Only the holder side may be provided with an elastic member having a convex shape on one surface.

  Examples of the magnetic transfer apparatus of the present invention and comparative examples will be described below.

  As the master carrier, a master carrier formed by forming a FeCo magnetic layer and a protective layer on a Ni substrate produced by a stamper method was used. The master carrier had a disc inner diameter of 20 mm and a disc outer diameter of 32 mm.

  The magnetic transfer apparatuses of Examples 1 to 9 are those described in the reference example of FIG. That is, an elastic member having a substantially uniform thickness and a spacer having a hole in a region corresponding to the non-transfer region of the master carrier are provided, and the master is interposed between the elastic member and the back surface of the master carrier. A magnetic transfer device for closely contacting the carrier and the slave medium was used. The spacer was made of a polyimide film and punched.

  The magnetic transfer apparatuses of Examples 10 to 18 are those described in the first embodiment. In other words, an elastic member is provided that has no spacer, and a region corresponding to the transfer region of the master carrier is formed in a convex shape, and the surface of the elastic member that has the convex portion is opposed to the back surface of the master carrier. In this state, the magnetic transfer device causes the master carrier and the slave medium to be in close contact with each other.

  The magnetic transfer apparatus of the comparative example is a magnetic transfer apparatus that includes an elastic member that does not include a spacer and has a substantially uniform thickness with no unevenness on the surface.

  In each example, an elastic member made of urethane rubber or nitrile rubber (NBR) was used.

  Magnetic transfer was performed under the same conditions except for the thickness of the elastic member, the thickness of the protrusion, the presence or absence of a spacer, and the thickness of the spacer. A commercially available hard disk was used as the transfer medium.

  The thicknesses of the elastic members and the spacers of Examples 1 to 9 and Comparative Example are as shown in Table 1. Moreover, the thickness of the elastic member of Examples 10-18 and the convex part thickness of an elastic member are as showing in Table 2. Here, the thickness of the elastic member in Examples 10 to 18 is t shown in FIG. 6B, and the thickness of the convex portion is t ′.

<Evaluation method>
For each of the magnetic recording media manufactured by performing magnetic transfer using the magnetic transfer apparatuses of Examples 1 to 18 and the comparative example, the envelope modulation of the signal output is measured, and the addition value and the subtraction value of the maximum value Mmax and the minimum value Mmini are measured. The ratio {(Mmax−Mmini) / (Mmax + Mmini)} × 100 (%) (hereinafter referred to as a modulation value) was determined. It means that the smaller the modulation value, the smaller the fluctuation of the signal value, and the better the quality of the transfer signal. That is, the smaller the modulation value, the better the adhesion between the master carrier and the slave medium during transfer. Here, if the modulation value is 3% or less, excellent (◎), more than 3%, less than 10% is good (○), 10% or more, less than 15% (△), 15% or more If so, it was evaluated as impossible (×).

  As shown in Tables 1 and 2, in contrast to the comparative example in which the spacer is not provided and the elastic member having a uniform thickness is provided, Examples 1 to 9 of the reference examples provided with the spacer and the elastic member having the convex portion. In Examples 10 to 18 of the present invention including the above, the modulation value was suppressed and the transfer signal was good.

  In Examples 1 to 7, the spacers having thicknesses exceeding 5 μm and 100 μm or less had higher transfer signal quality than Examples 3 to 5 having spacers with thicknesses outside this range. Similarly, in Examples 10 to 16, examples in which the convex thickness of the elastic member exceeds the preferable range of 5 μm and is 100 μm or less are the Examples 12 to 14 using the elastic member having the convex portion having a thickness outside this range. Compared with the signal quality was high.

  However, Example 8 and Example 17 in which the thickness of the elastic member is 90 μm, Example 9 in which the thickness of the elastic member is 3,500 μm, and Example 18 in which the thickness of 4000 μm is the thickness of the spacer or the convex portion of the elastic member. However, the signal quality was acceptable even though it was in the range of more than 5 μm and less than 100 μm. This is because the elastic member is too thin when the thickness is 90 μm, and the elastic member is excessively deformed during pressurization, resulting in an uneven portion between the master carrier and the slave medium. When the thickness is 3,500 μm and 4000 μm, This is probably because the elastic member is too thick and the rigidity of the elastic member is increased. As a result, the flexibility is lowered, and a non-uniform portion is generated. In addition, among those that satisfy the conditions of more than 10 μm and 50 μm or less, which is the more preferable range of the thickness of the spacer or the convex portion of the elastic member, the thickness of the elastic member is not too thin or too thick. The evaluation was excellent, and the transfer was very good.

The principal part perspective view which shows the transfer state of the magnetic transfer apparatus of this invention An exploded perspective view of a transfer holder according to a reference example not included in the present invention FIG. 2 is a plan view of the master carrier and spacer and a cross-sectional view of the spacer. Disassembled perspective view of transfer holder of magnetic transfer apparatus according to another reference example 1 is an exploded perspective view of a transfer holder of a magnetic transfer apparatus according to a first embodiment of the present invention. The top view and sectional drawing of the elastic member of FIG. Exploded perspective view of a transfer holder of a magnetic transfer apparatus according to a second embodiment

Explanation of symbols

1 Magnetic transfer device 2 Slave medium 3, 4 Master carrier
3b, 4b Information carrying surface
10 Transfer holder
11 First holder
12 Second holder
17, 18 Elastic member with convex part on one side
71 recess
72 Inner ring
73 Outer ring
74 Radiation section
80 Electromagnetic device
85 Magnetic field application means

Claims (6)

A master carrier having a surface partially formed with a transfer pattern corresponding to information to be transferred;
Holds a superposed body of a slave medium to be transferred and the master carrier closely attached to both sides of the slave medium, and presses the superposed body from the back side of the master carrier when a magnetic field for transfer is applied to the superposed body Holder to do,
In a magnetic transfer apparatus comprising an elastic member disposed between a back surface of the master carrier and the holder,
A magnetic transfer device, wherein a portion of the surface of the elastic member that faces the back surface of the master carrier, corresponding to the region where the transfer pattern of the master carrier is formed, is formed in a convex shape. A master carrier having a surface partially formed with a transfer pattern corresponding to information to be transferred;
Holds a superposed body of a slave medium to be transferred and the master carrier closely attached to both surfaces of the slave medium, and presses the superposed body from the back side of the master carrier when a magnetic field for transfer is applied to the superposed body. Holder to do,
In a magnetic transfer apparatus comprising an elastic member disposed between a back surface of the master carrier and the holder,
A magnetic transfer apparatus, wherein a portion of the surface of the elastic member facing the holder corresponding to a region where the transfer pattern of the master carrier is formed is formed in a convex shape.   The magnetic transfer device according to claim 1 or 2, wherein a thickness of the convex portion of the elastic member is more than 5 µm and not more than 100 µm. A superposed body of a slave medium to be transferred and a master carrier having a surface on which a transfer pattern corresponding to the information to be transferred is partially formed and in close contact with both sides of the slave medium is provided from the back side of the master carrier by a holder In a magnetic transfer method in which magnetic transfer is performed by applying a transfer magnetic field to the superimposed body in a state of being pressed and held,
Between the back surface of the master carrier and the holder, a portion corresponding to the region where the transfer pattern of the master carrier is formed on the surface of the elastic member that faces the back surface of the master carrier is formed in a convex shape. A magnetic transfer method, comprising: placing an elastic member, and pressing with the holder. A superposed body of a slave medium to be transferred and a master carrier having a surface on which a transfer pattern corresponding to the information to be transferred is partially formed and in close contact with both sides of the slave medium is provided from the back side of the master carrier by a holder. In a magnetic transfer method in which magnetic transfer is performed by applying a transfer magnetic field to the superimposed body in a state of being pressed and held,
An elastic member is provided between the back surface of the master carrier and the holder so that a portion corresponding to the area where the transfer pattern of the master carrier is formed is convex on the surface facing the holder. A magnetic transfer method comprising pressing with the holder.   6. The magnetic transfer apparatus according to claim 4, wherein a thickness of the convex portion of the elastic member is greater than 5 μm and not greater than 100 μm.

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